Apparatus for superheating steam.



PATENTED JUNE 2,1903. A. fBo'LToN. l f APPARATUS roRysUPBRHBATING STEAM. l

APPLICATION FILED JAN. 27, 1903.

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PATENT OFFICE...`

ANDREW BOLTON, OF MANCHESTER, ENGLAND.-

SPECIFICATION forming part of Letters Patent No. 730,08*?, dated J' une 2, 1903.

Application filed January 27, 1903. Serial No. 140,705. (No model.)

To all whom it may concern:

Beitknown thatl, ANDREW BOLTON, a subject of the King of Great Britain and Ireland,

residing at 49 Deansgate, Manchester, in the lcounty of Lancaster,'England, have invented new and useful Improvements in Apparatus for Superheating Steam, of which/the followiing is a specification.

Vof the downtake type. hitherto constructed.

In the accompanying drawings, illustrating my invention andto which I hereinafter refer, Figure l is an elevation, and Fig. `2 a plan, (both partly in section,) of my improved apparatus and connectionstherewith. Fig. 3is an end elevation of the same. Fig. 4 shows the same apparatus, drawn to an enlarged scale.

In the views the same letters refer to like I partsf vbreadth to the two upper chambers.

According to my present invention I `provide a box, as b, with superposcd horizontal chambers b', b2, and b3, the upper chambers b2 and bs being each of similar dimensions and the lower chamber b equal in length and I drill small holes in the plate b4, which divides the lower from the upper chambers Vand form holes corresponding in number and position, but largerin diameter,in the bottom of the box. I pass tubes d and dx, which are open at both ends through the last-named holes in the bottom of the box and lit the upper ends of said tubes in the division-plate b4. I insert the portions of these tubes which project below the bottom of the box b in tubes, as a and ax, respectively, which I it in theaforesaid holes formed in the bottom plate of the box b. These tubes, which are closed at their lower ends, are a little vlonger than the tubes they inclose, and their internaldiameter is sufficiently large to leave a space around the tubes d and dx. The result of this arrangement is that when the steam is admitted at the inlet-pipe, which may be e, it fills the vchamber b2, passes down the tubes d, and returns up on the outside of said tubes but inside the tubes a* a, into the chamber b. It

then descends the tubes and returns up` through the tubes dx to the lchamber b3, from whence it passes to a pipe, which may b e g, leading to the engine. The box and tubes, as hereinbefore described, are-fitted in' the liue'at'the rear end of a boiler, as c, said tubes extending downward in the ilue, so that the flames and hotl gases from the furnace pass around said tubes in their passage to the chimney, the steam passing through the superheater obtaining the Vfull effect of the issuing heat by circulating through the tubes in a circuitous course more than once. By these means eachE particle of steam sweeps an increased area of heating-surface at an increased velocity.

I donot confine myself to the lprecise nurnber of tubes in each group as shown on the drawings or the number of groups in a series, as these may be arranged according to the space in which said superheatersare intended to be'placed, the boxes in which the tubes are fitted being correspondingly divided.

An improved apparatus .for superheating steam, comprising'a box, a `horizontal plate secured therein, dividing the box into upper and lower horizontal chambers, a vertical plate centrally dividing the upper chamber in two, tubes each having a lower closed end and depending from the lower chamber, their upper open ends being in 'communication with said chamber,.in combination with openended tubesl within aforesaid tubes, each open-ended tube terminating near the closed end of its surrounding tube, said open-ended tubes being secured in the horizontal plate at their upper ends and communicating, some with one division of the upper chamber, and others with the-other division, substantially as described.

In testimony whereof I have signed my name `to this specification in the presence of two subscribing witnesses.

ANDREW BOLTON.

Witnesses:

JNO. HUGHES,

J. ERNEST HUGHES. 

